Table 1.

Characteristics of the biological sewage sludge and produced biochar.

Parameter	Unit	Sewage sludge	Biochar
Moisture	%	8.0	2.0
Ash	%a	23.7 ± 0.42	34.4 ± 0.57
Total N	%	3.26 ± 0.24	1.73 ± 0.35
Available P	mg/kg	3874 ± 98	1298 ± 70
Exchangeable K	mg/kg	3293 ± 114	1400 ± 39
Total Na	mg/kg	856 ± 134	1054 ± 45
pH	–	7.1 ± 0.2	6.7 ± 0.1
EC	dS/m	3.38 ± 0.04	1.76 ± 0.04

^aOn dry basis.